JP2008261411A - Disk brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk brake device stabilizing a vibration system by stabilizing the behavior of a brake pad in braking. <P>SOLUTION: When a brake torque is input from a disk rotor 2 to the brake pad 6, the peripheral surface of the semicircular projecting portion 6C of a back metal 6B is brought into linear contact with and abuts on the torque receiving surface 3D of a mounting 3 on the side of an arm portion 3A. At this time, rotation moment acting on the brake pad 6 is received in a manner that the moment transmitting surface 6F of the back metal 6B is brought into linear contact with and abuts on the moment receiving surface 3H of the mounting 3 on the side of the arm portion 3B through the circumferential surface of a columnar member 7, and by the reaction thereof, the peripheral surface of the semicircular projecting portion 6C of the back metal 6B is brought into linear contact with and abuts on a moment receiving surface 3E on the side of the arm portion 3A, resulting in stabilization of the behavior of the brake pad 6 and the vibration system of the disk brake device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disc brake device equipped as a braking device in a vehicle, for example.

  In general, the disc brake device presses the brake pads against the rotor surfaces on both sides of the disc rotor to make frictional contact, and the brake torque input from the disc rotor to the brake pads is transmitted from the torque transmission portion at the end of the brake pad to the vehicle body. Is transmitted to the torque receiving portion of the mounting (torque member) on the side, and the torque receiving portion receives the braking torque to obtain the braking force.

  Here, the brake pad has a structure in which a back metal is joined to a pad member that is pressed against the rotor surface of the disk rotor and comes into frictional contact. Normally, convex-shaped torque transmission parts are provided at both ends of the back metal. It is integrally formed. Corresponding to this, the mounting is formed with a pair of concave groove-shaped torque receiving portions for locking the convex piece-like torque transmitting portions of the back metal (see, for example, Patent Document 1).

In this type of disc brake device, a pair of convex torque transmitting portions formed at both ends of the back plate of the brake pad and a pair of mountings are provided so that the brake pad can slide in the axial direction of the disc rotor. A predetermined clearance is provided between the groove-shaped torque receiving portion.
JP 2006-90464 A

  By the way, in the conventional disc brake device as described in Patent Document 1, a predetermined clearance is provided between the convex piece-shaped torque transmitting portions at both ends of the brake pad and the pair of concave groove-shaped torque receiving portions of the mounting. Therefore, when brake torque is input from the disc rotor to the brake pad during braking, the behavior of the brake pad tends to become unstable.

  That is, when the frictional contact portion between the rotor surface of the disc rotor and the pad member of the brake pad changes in the radial direction of the disc rotor during braking, the rotational moment acting on the brake pad fluctuates, and the brake pad The posture of the brake pad may be changed in an unstable manner, and the behavior of the brake pad is likely to be unstable.

  In this case, the contact portion between the convex torque transmitting portions at both ends of the brake pad and the pair of concave groove-shaped torque receiving portions of the mounting changes, and the entire vibration system of the disc brake device becomes unstable. . As a result, a brake squeal phenomenon may occur in the disc brake device.

  Therefore, an object of the present invention is to provide a disc brake device that can stabilize the vibration system by stabilizing the behavior of the brake pad during braking.

  The disc brake device according to the present invention is a disc brake device configured to transmit and receive the brake torque input from the disc rotor to the brake pad during braking from the torque transmitting portion of the brake pad to the mounting torque receiving portion. The brake pad is provided with first and second torque transmitting portions at diagonal portions spaced apart from each other in the radial direction and the circumferential direction of the disk rotor, and the mounting is provided on each of the first and second torque transmitting portions. Corresponding first and second torque receiving portions are provided, and each of the first and second torque receiving portions receives a receiving surface of a brake torque input to the brake pad and a rotational moment acting on the brake pad. Each of the first and second torque transmitting portions has a receiving surface for a brake torque and a receiving for a rotational moment. It characterized by having a circumferential surface for line contact with.

  In the disc brake device according to the present invention, when brake torque is input from the disc rotor to the brake pad during braking, the peripheral surfaces of the first and second torque transmitting portions of the brake pad are mounted on the first and second mounting surfaces. The brake torque is received by the brake torque receiving surface and the rotational moment receiving surface of the torque receiving portion of the torque receiving portion so that the brake torque input to the brake pad is received and the rotational moment acting on the brake pad is received. It is done.

  Here, the first and second torque transmitting portions of the brake pad are disposed at diagonal portions spaced apart from each other in the radial direction and the circumferential direction of the disk rotor, and the peripheral surface thereof is the first, The second torque receiving portion is configured to be in line contact with the receiving surface of the brake torque and the receiving surface of the rotational moment. Therefore, even if the rotational moment acting on the brake pad changes, the line contact state of the first and second torque transmitting portions of the brake pad with respect to the first and second torque receiving portions of the mounting does not change, and the brake pad Is stabilized, and the vibration system of the disc brake device is stabilized.

  In the disc brake device of the present invention, if the pressing means for bringing the first and second torque transmitting portions into contact with the first and second torque receiving portions is incorporated in the brake pad, This is preferable because a clonk noise at the start of braking is prevented.

  In the disc brake device according to the present invention, the first and second torque transmitting portions of the brake pad are arranged at diagonal portions spaced apart from each other in the radial direction and the circumferential direction of the disc rotor, and the peripheral surface thereof is Since the first and second torque receiving portions of the mounting are configured to be in line contact with the receiving surface of the brake torque and the receiving surface of the rotational moment, even if the rotational moment acting on the brake pad changes during braking, The line contact state of the first and second torque transmitting portions of the brake pad with respect to the first and second torque receiving portions of the mounting does not change. Therefore, according to the present invention, the behavior of the brake pad during braking can be stabilized, and the vibration system of the disc brake device can be stabilized.

  Hereinafter, the best embodiment of a disc brake device according to the present invention will be described with reference to the drawings. In the drawings to be referred to, FIG. 1 is a perspective view showing an external appearance of a disc brake device according to an embodiment of the present invention, FIG. 2 is a front view of a brake pad attached to the mounting shown in FIG. 1, and FIG. It is a cross-sectional arrow view along line III-III.

  A disc brake device according to an embodiment is configured for a vehicle. For example, as shown in FIG. 1, a disc rotor 2 fixed to an axle hub 1 and integrally rotated, a suspension part of a vehicle body not shown, and the like. A mounting (torque member) 3 supported so as to straddle the outer periphery of the disk rotor 2 and a slidable parallel to the rotation axis of the disk rotor 2 via a pair of slide pins 4 and 4 on the mounting 3 A mounted floating caliper 5 and a pair of inner and outer brake pads 6 and 6 (see FIG. 2) mounted between the caliper 5 and the disk rotor 2 are provided.

  The disk rotor 2 rotates, for example, in the direction of a solid arrow when the vehicle moves forward, and rotates in the direction of the opposite dashed arrow when the vehicle moves backward. During forward braking and reverse braking of the vehicle, the inner rotor surface 2A and the outer rotor surface 2B on the outer peripheral portion of the disc rotor 2 are sandwiched between a pair of inner and outer brake pads 6 and 6 (see FIG. 2).

  The caliper 5 is disposed so as to straddle the outer periphery of the disk rotor 2, and a pair of claw portions 5 </ b> A and 5 </ b> A are provided at the outer end thereof. The pair of claw portions 5A and 5A press the outer brake pad 6 against the outer rotor surface 2B of the disc rotor 2 shown in FIG. Further, a cylinder portion 5 </ b> B is provided at the inner end portion of the caliper 5. The cylinder portion 5B presses the inner brake pad 6 against the inner rotor surface 2A of the disc rotor 2 shown in FIG. 2 by a piston (not shown) fitted into the cylinder portion 5B.

  As shown in FIG. 2, the pair of inner and outer brake pads 6 and 6 have a structure in which back metal 6B and 6B are joined to pad members 6A and 6A. The pair of brake pads 6 and 6 are pressed against the inner rotor surface 2A and the outer rotor surface 2B of the disc rotor 2 to make frictional contact with the pad members 6A and 6A during forward braking and reverse braking of the vehicle.

  Here, at the time of forward braking and reverse braking of the vehicle, the brake torque input from the inner rotor surface 2A and the outer rotor surface 2B of the disc rotor 2 to the pair of brake pads 6 and 6 via the pad members 6A and 6A is received. In addition, the mounting 3 is formed with an arm portion 3A and an arm portion 3B that are spaced from each other in the circumferential direction of the disk rotor 2.

  As shown in FIG. 3, one arm portion 3 </ b> A is arranged to face one end portion of the brake pad 6, which is a delivery side of the disc rotor 2 when the vehicle moves forward, and the other arm portion 3 </ b> B is It is arranged to face the other end portion side of the brake pad 6 that becomes the delivery side of the disc rotor 2 when the vehicle is retracted.

  Here, a first torque receiving portion that receives brake torque input from the back metal 6B of the brake pad 6 when the vehicle moves forward is formed at the base end portion of the one arm portion 3A, and the distal end of the other arm portion 3B. The portion is formed with a second torque receiving portion that receives a brake torque input from the back metal 6B of the brake pad 6 when the vehicle is reverse.

  The first torque receiving portion is configured by an L-shaped cutout portion 3C formed inside the base end portion of one arm portion 3A. The L-shaped notch 3C includes a torque receiving surface 3D as a receiving surface for a brake torque input from one end of the brake pad 6 and a receiving surface for a rotational moment acting on one end of the brake pad 6. And a moment receiving surface 3E.

  Further, the second torque receiving portion is configured by an L-shaped cutout portion 3F formed inside the tip portion of the other arm portion 3B. The L-shaped notch 3F has a torque receiving surface 3G as a receiving surface for the brake torque inputted from the other end of the brake pad 6 and a rotational moment acting on the other end of the brake pad 6. And a moment receiving surface 3H as a receiving surface.

  On the other hand, the brake pad 6 includes a first torque transmitting portion corresponding to the first torque receiving portion on the mounting 3 side and a second torque transmitting portion corresponding to the second torque receiving portion in the radial direction of the disk rotor 2. And provided at diagonal portions of the brake pads 6 spaced apart from each other in the circumferential direction.

  The first torque transmitting portion is configured by a semicircular protruding portion 6 </ b> C formed integrally with the back metal 6 </ b> B of the brake pad 6. The semicircular projecting portion 6C has a semicircular circumferential surface in line contact with the torque receiving surface 3D and the moment receiving surface 3E of the cutout portion 3C on the arm portion 3A side which is the first torque receiving portion. It is possible.

  Here, the second torque transmitting portion is an L-shaped notch portion 6D formed on the back metal 6B of the brake pad 6 so as to face the notch portion 3F on the arm portion 3B side which is the second torque receiving portion. And a cylindrical member 7 accommodated between the notch portion 6D and the notch portion 3F on the arm portion 3B side, and a pressing means interposed between the cylindrical member 7 and the notch portion 6D on the back metal 6B side. It is comprised with the leaf | plate spring member 8 provided.

  The L-shaped notch 6D has a torque transmission surface 6E and a moment transmission surface 6F that face the torque receiving surface 3G and the moment receiving surface 3H of the notch 3F on the arm 3B side, respectively. The cylindrical member 7 has circumferential surfaces that are respectively connected to the torque receiving surface 3G and the moment receiving surface 3H of the notch 3F on the arm 3B side and the moment transmission surface 6F of the notch 6D on the back metal 6B side. Contact is possible.

  The leaf spring member 8 is interposed between the torque transmission surface 6E of the notch 6D on the back metal 6B side and the columnar member 7. Here, as shown in FIG. 4, curved portions 8A and 8A are formed at both ends in the longitudinal direction of the leaf spring member 8, and a pair of sandwiching pieces 8B, 8B is formed by bending.

  The pair of sandwiching pieces 8 </ b> B and 8 </ b> B of the leaf spring member 8 sandwich an annular mounting groove 7 </ b> A formed in the middle portion of the cylindrical member 7 in the longitudinal direction. Thus, the leaf spring member 8 is positioned in the longitudinal direction of the cylindrical member 7 and attached to the cylindrical member 7. In this attached state, the curved portions 8A and 8A of the leaf spring member 8 are cut off on the back metal 6B side shown in FIG. The torque transmission surface 6E of the notch 6D is pressed.

  The structures of the notch 3C on the arm 3A side, the notch 3F on the arm 3B side, the protrusion 6C of the back metal 6B of the brake pad 6 and the notch 6D shown in FIG. 3 are shown in FIG. The structure on the side corresponding to the inner rotor surface 2A of the disk rotor 2 is also configured in the same manner on the side corresponding to the outer rotor surface 2B of the disk rotor 2.

  In the disc brake device of the present embodiment configured as described above, when a braking operation is performed by a vehicle brake pedal (not shown), the brake hydraulic pressure corresponding to the depression operation of the brake pedal is the cylinder of the caliper 5 shown in FIG. A piston (not shown) advances by being supplied to the part 5B. Then, the piston presses the back metal 6B of the inner brake pad 6 shown in FIG. 2, so that the claw portions 5A, 5A of the caliper 5 by the reaction force of the outer brake pad 6 shown in FIG. Push back metal 6B.

  As a result, the pad member 6A of the inner brake pad 6 is in frictional contact with the inner rotor surface 2A of the disc rotor 2, and the pad member 6A of the outer brake pad 6 is in frictional contact with the outer rotor surface 2B of the disc rotor 2. Thus, brake torque is input from the inner rotor surface 2A and the outer rotor surface 2B of the disc rotor 2 to the pad member 6A of the inner brake pad 6 and the pad member 6A of the outer brake pad 6, respectively.

  Here, at the time of forward braking of the vehicle in which the disc rotor 2 is rotating forward in the direction of the solid line arrow in FIG. 1, brake torque is input from the disc rotor 2 to, for example, the pad member 6A of the inner brake pad 6 shown in FIG. Then, the peripheral surface of the semicircular protruding portion 6C formed on the back metal 6B on one end side of the brake pad 6 serving as the delivery side of the disc rotor 2 is formed on the arm portion 3A side of the mounting 3. Line contact and contact with the torque receiving surface 3D of the notch 3C. Thus, the brake torque input to the pad member 6A of the brake pad 6 is received by the arm portion 3A of the mounting 3, and the forward braking state is set.

  In such a forward braking state, a rotational moment is applied to the brake pad 6 around the contact portion between the peripheral surface of the protruding portion 6C of the back metal 6B and the torque receiving surface 3D on the arm portion 3A side. When the frictional contact portion between the inner rotor surface 2A of the disc rotor 2 and the pad member 6A of the brake pad 6 changes in the radial direction of the disc rotor 2, the rotational moment changes accordingly.

  In this case, the moment transmitting surface 6F of the notch 6D formed on the back metal 6B of the brake pad 6 is connected to the moment receiving surface 3H of the notch 3F on the arm 3B side of the mounting 3 via the circumferential surface of the cylindrical member 7. The circumferential surface of the semicircular protrusion 6C of the back metal 6B of the brake pad 6 makes a line contact with the moment receiving surface 3E of the notch 3C on the arm 3A side by the reaction force. By contacting, the rotational moment acting on the brake pad 6 is reliably received.

  At that time, the circumferential surface of the cylindrical member 7 and the moment receiving surface 3H of the notch portion 3F on the arm portion 3B side are brought into line contact with each other, and the circumferential surface of the protruding portion 6C of the back metal 6B of the brake pad 6 is contacted. Since the moment receiving surface 3E of the notch 3C on the arm 3A side comes into contact with the moment receiving surface 3E, the contact state is maintained without fluctuation. As a result, the behavior of the brake pad 6 is stabilized.

  In the case of reverse braking of the vehicle in which the disc rotor 2 is reversed in the direction of the broken line arrow in FIG. 1, brake torque is input from the disc rotor 2 to, for example, the pad member 6A of the inner brake pad 6 shown in FIG. Then, the torque transmission surface 6E of the notch 6D formed in the back metal 6B on the other end side of the brake pad 6 serving as the delivery side of the disc rotor 2 presses the cylindrical member 7 via the leaf spring member 8. Thus, the circumferential surface of the columnar member 7 comes into line contact with and contacts the torque receiving surface 3G of the notch 3F on the arm 3B side of the mounting 3. Thus, the brake torque input to the pad member 6A of the brake pad 6 is received by the arm portion 3B of the mounting 3 and the reverse braking state is established.

  In such a reverse braking state, a rotational moment centering on a contact portion between the circumferential surface of the cylindrical member 7 and the torque receiving surface 3G on the arm portion 3B side acts on the brake pad 6. In this case, the circumferential surface of the semicircular protruding portion 6C of the back metal 6B of the brake pad 6 comes into line contact with and comes into contact with the moment receiving surface 3E of the cutout portion 3C on the arm portion 3A side, and the column member 7 is caused by the reaction force. Since the circumferential surface of this is in line contact with and abuts against the moment receiving surface 3H on the arm portion 3B side, the rotational moment acting on the brake pad 6 is reliably received.

  At that time, the circumferential surface of the protrusion 6C of the back pad 6B of the brake pad 6 and the moment receiving surface 3E of the notch 3C on the arm 3A side come into line contact with each other, and the circumferential surface of the cylindrical member 7 and the arm Since the moment receiving surface 3H of the 3B-side notch 3F comes into line contact with the moment receiving surface 3H, the contact state is maintained without fluctuation. As a result, the behavior of the brake pad 6 is stabilized.

  Therefore, according to the disc brake device of the present embodiment, the behavior of the brake pad 6 is stabilized even when the rotational moment acting on the brake pad 6 varies during forward braking and reverse braking of the vehicle. And the vibration system of the disc brake device can be stabilized. As a result, when the vibration system of the disc brake device is tuned in advance so as to suppress the brake squeal phenomenon, the brake squeal phenomenon can be suppressed according to the intended tuning.

  Here, when the vehicle is not braked, the brake pad 6 is pressed toward the one end by the leaf spring member 8 shown in FIG. 5, so that the peripheral surface of the protrusion 6C of the back metal 6B of the brake pad 6 is an arm. The torque receiving surface 3D and the moment receiving surface 3E of the notched portion 3C on the side of the portion 3A are in contact with the torque receiving surface 3D and the moment receiving surface 3E, and the circumferential surface of the cylindrical member 7 is the torque receiving surface 3G and the moment receiving surface of the notched portion 3F on the arm 3B side. It is in contact with 3H.

  Therefore, according to the disc brake device of the present embodiment, it is possible to prevent or suppress rattle noise when the vehicle is not braked and cron noise when braking is started.

  The disc brake device of the present invention is not limited to the above-described embodiment. For example, the positions of the protrusion 6C and the notch 6D of the back metal 6B of the brake pad 6 may be interchanged. In this case, the columnar member 7 and the leaf spring member 8 are arranged so as to face the cutout portion 3C on the arm portion 3A side.

1 is a perspective view showing an external appearance of a disc brake device according to an embodiment of the present invention. It is a front view of the brake pad with which the mounting shown in FIG. 1 was mounted | worn. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a disassembled perspective view which shows the leaf | plate spring member shown in FIG. 3 with the column member. FIG. 4 is a cross-sectional arrow view corresponding to FIG. 3 during forward braking of the vehicle. FIG. 4 is a cross-sectional arrow view corresponding to FIG. 3 during reverse braking of the vehicle.

Explanation of symbols

  2 ... disc rotor, 2A ... inner rotor surface, 2B ... outer rotor surface, 3 ... mounting, 3A, 3B ... arm part, 3C ... notch part, 3D ... torque receiving surface, 3E ... moment receiving surface, 3F ... notch Part, 3G ... torque receiving surface, 3H ... moment receiving surface, 5 ... caliper, 6 ... brake pad, 6A ... pad member, 6B ... back metal, 7 ... cylindrical member, 7A ... mounting groove, 8 ... leaf spring member, 8A ... Curved part, 8B ... clamping piece.

Claims (2)

A disc brake device configured to transmit and receive a brake torque input from a disc rotor to a brake pad during braking from a torque transmitting portion of the brake pad to a torque receiving portion of the mounting,
The brake pad includes first and second torque transmission portions at diagonal portions spaced from each other in the radial direction and the circumferential direction of the disc rotor, and the mounting corresponds to each of the first and second torque transmission portions. First and second torque receivers,
Each of the first and second torque receiving portions has a receiving surface for a brake torque input to the brake pad and a receiving surface for a rotational moment acting on the brake pad, and the first and second torque transmitting portions. Each of which has a peripheral surface in line contact with the receiving surface of the brake torque and the receiving surface of the rotational moment.   2. The disc brake device according to claim 1, wherein pressing means for bringing the first and second torque transmitting portions into contact with the first and second torque receiving portions is incorporated in a brake pad.

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